Lost package

I ordered an Amazon package and it arrived Sunday. I went to the mailroom Monday to see where it was because I didn’t get an email about the package being ready to pick up. I was then told the package was brought to towers. So Tuesday I went to towers and they don’t me they didn’t have it. So then today, Wednesday I called the mailroom manger and he told me that the package is nowhere in the system. What should I do?